SYNOPSIS
cleanup [generic Postfix daemon options]
DESCRIPTION
The cleanup daemon processes inbound mail, inserts it into the incoming
mail queue, and informs the queue manager of its arrival.
The cleanup daemon always performs the following transformations:
o Insert missing message headers: (Resent-) From:, To:, Message-
Id:, and Date:.
o Transform envelope and header addresses to the standard
user@fully-qualified-domain form that is expected by other Post-
fix programs. This task is delegated to the trivial-rewrite(8)
daemon.
o Eliminate duplicate envelope recipient addresses.
The following address transformations are optional:
o Optionally, rewrite all envelope and header addresses according
to the mappings specified in the canonical(5) lookup tables.
o Optionally, masquerade envelope sender addresses and message
header addresses (i.e. strip host or domain information below
all domains listed in the masquerade_domains parameter, except
for user names listed in masquerade_exceptions). By default,
address masquerading does not affect envelope recipients.
o Optionally, expand envelope recipients according to information
found in the virtual(5) lookup tables.
The cleanup daemon performs sanity checks on the content of each mes-
sage. When it finds a problem, by default it returns a diagnostic sta-
tus to the client, and leaves it up to the client to deal with the
problem. Alternatively, the client can request the cleanup daemon to
bounce the message back to the sender in case of trouble.
STANDARDS
RFC 822 (ARPA Internet Text Messages)
RFC 2045 (MIME: Format of Internet Message Bodies)
RFC 2046 (MIME: Media Types)
DIAGNOSTICS
Problems and transactions are logged to syslogd(8).
BUGS
Table-driven rewriting rules make it hard to express if then else and
other logical relationships.
CONFIGURATION PARAMETERS
enable_errors_to (no)
Report mail delivery errors to the address specified with the
non-standard Errors-To: message header, instead of the envelope
sender address.
BUILT-IN CONTENT FILTERING CONTROLS
Postfix built-in content filtering is meant to stop a flood of worms or
viruses. It is not a general content filter.
body_checks (empty)
Optional lookup tables for content inspection as specified in
the body_checks(5) manual page.
header_checks (empty)
Optional lookup tables for content inspection of primary non-
MIME message headers, as specified in the header_checks(5) man-
ual page.
Available in Postfix version 2.0 and later:
body_checks_size_limit (51200)
How much text in a message body segment (or attachment, if you
prefer to use that term) is subjected to body_checks inspection.
mime_header_checks ($header_checks)
Optional lookup tables for content inspection of MIME related
message headers, as described in the header_checks(5) manual
page.
nested_header_checks ($header_checks)
Optional lookup tables for content inspection of non-MIME mes-
sage headers in attached messages, as described in the
header_checks(5) manual page.
MIME PROCESSING CONTROLS
Available in Postfix version 2.0 and later:
disable_mime_input_processing (no)
Turn off MIME processing while receiving mail.
mime_boundary_length_limit (2048)
The maximal length of MIME multipart boundary strings.
mime_nesting_limit (100)
The maximal nesting level of multipart mail that the MIME pro-
cessor will handle.
strict_8bitmime (no)
Enable both strict_7bit_headers and strict_8bitmime_body.
strict_7bit_headers (no)
Reject mail with 8-bit text in message headers.
Optional address that receives a "blind carbon copy" of each
message that is received by the Postfix mail system.
Available in Postfix version 2.1 and later:
sender_bcc_maps (empty)
Optional BCC (blind carbon-copy) address lookup tables, indexed
by sender address.
recipient_bcc_maps (empty)
Optional BCC (blind carbon-copy) address lookup tables, indexed
by recipient address.
ADDRESS TRANSFORMATION CONTROLS
Address rewriting is delegated to the trivial-rewrite(8) daemon. The
cleanup(8) server implements table driven address mapping.
empty_address_recipient (MAILER-DAEMON)
The recipient of mail addressed to the null address.
canonical_maps (empty)
Optional address mapping lookup tables for message headers and
envelopes.
recipient_canonical_maps (empty)
Optional address mapping lookup tables for envelope and header
recipient addresses.
sender_canonical_maps (empty)
Optional address mapping lookup tables for envelope and header
sender addresses.
masquerade_classes (envelope_sender, header_sender, header_recipient)
What addresses are subject to address masquerading.
masquerade_domains (empty)
Optional list of domains whose subdomain structure will be
stripped off in email addresses.
masquerade_exceptions (empty)
Optional list of user names that are not subjected to address
masquerading, even when their address matches $masquer-
ade_domains.
propagate_unmatched_extensions (canonical, virtual)
What address lookup tables copy an address extension from the
lookup key to the lookup result.
Available before Postfix version 2.0:
virtual_maps (empty)
Optional lookup tables with a) names of domains for which all
showq(8) queue displays.
header_size_limit (102400)
The maximal amount of memory in bytes for storing a message
header.
hopcount_limit (50)
The maximal number of Received: message headers that is allowed
in the primary message headers.
in_flow_delay (1s)
Time to pause before accepting a new message, when the message
arrival rate exceeds the message delivery rate.
message_size_limit (10240000)
The maximal size in bytes of a message, including envelope
information.
Available in Postfix version 2.0 and later:
header_address_token_limit (10240)
The maximal number of address tokens are allowed in an address
message header.
mime_boundary_length_limit (2048)
The maximal length of MIME multipart boundary strings.
mime_nesting_limit (100)
The maximal nesting level of multipart mail that the MIME pro-
cessor will handle.
queue_file_attribute_count_limit (100)
The maximal number of (name=value) attributes that may be stored
in a Postfix queue file.
Available in Postfix version 2.1 and later:
virtual_alias_expansion_limit (1000)
The maximal number of addresses that virtual alias expansion
produces from each original recipient.
virtual_alias_recursion_limit (1000)
The maximal nesting depth of virtual alias expansion.
MISCELLANEOUS CONTROLS
config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf con-
figuration files.
daemon_timeout (18000s)
How much time a Postfix daemon process may take to handle a
request before it is terminated by a built-in watchdog timer.
The maximal number of connection requests before a Postfix dae-
mon process terminates.
myhostname (see 'postconf -d' output)
The internet hostname of this mail system.
myorigin ($myhostname)
The default domain name that locally-posted mail appears to come
from, and that locally posted mail is delivered to.
process_id (read-only)
The process ID of a Postfix command or daemon process.
process_name (read-only)
The process name of a Postfix command or daemon process.
queue_directory (see 'postconf -d' output)
The location of the Postfix top-level queue directory.
soft_bounce (no)
Safety net to keep mail queued that would otherwise be returned
to the sender.
syslog_facility (mail)
The syslog facility of Postfix logging.
syslog_name (postfix)
The mail system name that is prepended to the process name in
syslog records, so that "smtpd" becomes, for example, "post-
fix/smtpd".
Available in Postfix version 2.1 and later:
enable_original_recipient (yes)
Enable support for the X-Original-To message header.
FILES
/etc/postfix/canonical*, canonical mapping table
/etc/postfix/virtual*, virtual mapping table
SEE ALSO
trivial-rewrite(8), address rewriting
qmgr(8), queue manager
header_checks(5), message header content inspection
body_checks(5), body parts content inspection
canonical(5), canonical address lookup table format
virtual(5), virtual alias lookup table format
postconf(5), configuration parameters
master(8), process manager
syslogd(8), system logging
README FILES
CLEANUP(8)
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